Administration and Provisioning
8-116 Issue 8.0 July 2002
To implement the OC3 operating protection mode, the following
conditions must exist:
■ Both slots in the slot pair must be provisioned "1+1"
■ Both slots in the slot pair must be EQ
■ A cross-connection must exist between either slot (or port) in
the slot pair and an STS-3 (or STS-1) tributary.
NOTE:
When two independent 1-way 1+1 circuits share the same OC3 (1.3
STD) circuit pack pair, provision the 1+1 system in the drop direction
as two 0x1 systems that are bridged. This prevents K-byte signals
(used for protection switching) and certain maintenance signals that
are based on 2-way service from being returned to the far end
terminal.
When a slot pair transitions from 0x1 unprotected operation to 1+1
protected operation, the FT-2000 OC-48 Add/Drop-Rings Terminal
automatically selects the add cross-connection from the "A" slot to
the STS-3 tributary as active and the add cross-connection from the
"B" slot to the same STS-3 tributary as standby. If the add
cross-connection from the "B" slot to the STS-3 tributary was
previously active and operating unprotected (0x1), a brief service hit
(<60 msec) will be observed. When a slot pair transitions from 0x1
operation to 1+1 operation, any DCC assignment to the A slot
changes to a DCC assignment to the slot pair. Any DCC assignment
to the B slot will be deleted.
When a slot pair transitions from 1+1 protected operation to 0x1
unprotected operation, the FT-2000 OC-48 Add/Drop-Rings
Terminal automatically selects the add/drop cross-connections
between the "A" slot and the STS-3 tributary as active. If the add
cross-connection from the "B" slot to the STS-3 tributary was
previously active, a brief service hit (<60 msec) will be observed.
When a slot pair transitions from 1+1 operation to 0x1 operation,
any DCC assignment to the slot pair changes to a DCC assignment
to the A slot only. There will be no DCC assignment to the B slot.
!
CAUTION:
When transitioning an OC-3 line from 1+1 protected operation to 0x1
unprotected operation, always start with the slot pair at the tail end of
the OC-3 line. When a slot pair transitions from 1+1 operation to 0x1
operation, the FT-2000 OC-48 Add/Drop-Rings Terminal
automatically selects the add/drop cross-connections between the
"A" slot and the STS-3 tributary as active. If the drop
cross-connection from the STS-3 tributary to the "B" slot was
previously active, the OC3 (1.3 STD) circuit pack in the "B" slot
transmits path AIS toward the OC-3 line. The receiving terminal
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